Undrained stability of a square tunnel where the shear strength increases linearly with depth

Title: Undrained stability of a square tunnel where the shear strength increases linearly with depth
Creator: Wilson, Daniel W.; Abbo, Andrew J.; Sloan, Scott W.; Lyamin, Andrei V.
Relation: ARC.FL0992039
Relation: Computers and Geotechnics Vol. 49, p. 314-325
Publisher Link: http://dx.doi.org/10.1016/j.compgeo.2012.09.005
Publisher: Pergamon Press
Resource Type: journal article
Date: 2013
Description: This paper investigates the stability of a plane strain square tunnel in undrained clay, where the shear strength profile increases linearly with depth. The stability for a range of tunnel geometries and soil conditions are found using rigid-block upper bound methods as well as finite element limit analysis. The latter procedures employ a discrete form of the bound theorems of classical plasticity, use a bespoke conic programming scheme to solve the resulting optimisation problems, and bracket the true collapse load with upper and lower bound solutions to within 5% for all the cases considered. Results from the parametric study are summarised in the form of stability charts. An approximate closed-form expression is developed for use by practising engineers.
Subject: tunnels; stability; limit analysis; finite element methods
Identifier: http://hdl.handle.net/1959.13/1060912
Identifier: uon:16840
Identifier: ISSN:0266-352X
Language: eng
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